title: Relating monolithic and granular leaching from contaminated soil treated with different cementitious binders.
abstract: This work employed a clayey, silty, sandy gravel contaminated with a mixture of metals (Cd, Cu, Pb, Ni and Zn) and diesel. The contaminated soil was treated with 5 and 10% dosages of different cementitious binders. The binders include Portland cement, cement-fly ash, cement-slag and lime-slag mixtures. Monolithic leaching from the treated soils was evaluated over a 64-day period alongside granular leachability of 49- and 84-day old samples. Surface wash-off was the predominant leaching mechanism for monolithic samples. In this condition, with data from different binders and curing ages combined, granular leachability as a function of monolithic leaching generally followed degrees 4 and 6 polynomial functions. The only exception was for Cu, which followed the multistage dose-response model. The relationship between both leaching tests varied with the type of metal, curing age/residence time of monolithic samples in the leachant, and binder formulation. The results provide useful design information on the relationship between leachability of metals from monolithic forms of S/S treated soils and the ultimate leachability in the eventual breakdown of the stabilized/solidified soil.
authors.affiliation: Geotechnical and Environmental Group, Cambridge University Engineering Department, Trumpington Street, Cambridge, United Kingdom. regkogbara@yahoo.com
authors.forename: Reginald B
authors.initials: RB
authors.lastname: Kogbara
authors.forename: Abir
authors.initials: A
authors.lastname: Al-Tabbaa
authors.forename: Julia A
authors.initials: JA
authors.lastname: Stegemann
mesh_terms: D003252:Construction Materials; D005742:Gasoline; D006838:Hydrocarbons / Q000032:analysis* / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D019216:Metals, Heavy / Q000032:analysis* / Q000737:chemistry; D012989:Soil Pollutants / Q000032:analysis* / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D005742:Gasoline; D006838:Hydrocarbons; D019216:Metals, Heavy; D012989:Soil Pollutants; D014874:Water Pollutants, Chemical